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Digestion and Absorption

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Write a note on small intestine of man.

Small intestine : Small intestine is distinguishable into three regions, a ‘C’ shaped duodenum, a long coiled middle portion jejunum and a highly coiled ileum.

(1) Duodenum : It has a length of 25 cm. It is C-shaped. The accessory pancreatic duct and haptopancreatic duct opens into duodenum independently. The haptopancreatic duct brings bile and pancreatic juice from gall bladder and pancreas into duodenum respectively. Its opening is guarded by sphincter of oddi. In duodenum, mainly digestion of food occurs. The bile and pancreatic juice act on food in duodenum.

(2) Jejunum : It has a length of bout 6.0 – 7.00 m. Jejunum has length of 4 m and ileum has length of 2.5 m.

(3) Ileum : It is 3 cm wide and is highly coiled. In jejunum-ileum digestion is completed. The inner lining of jejunum-ileum has folds called villi. The cells of villi has microvilli which increase the absorptive surface area.


What is Diphyodont ?

Diphyodont is the condition of having two set of teeth during the life of an organism. For example : humans are diphyodont as they have two set of teeth namely temporary milk or deciduous teeth which are replaced by permanent or adult teeth. 


What are Sanguivorous animals ?

The animals which suck blood e.g. leech, vampire bat, female mosquito etc.

What is the function of enamel in digestion?

The enamel helps in the mastication of food.

What is the order of arrangement of teeth in each half of the upper and lower jaw ?

The order of arrangement of teeth in each half of the upper and lower jaw is I,C,PM,M.  I (incisors), C (cannine), PM (premolars), M (molars).

Name the fat soluble vitamins.

Vit A, D, E and  are fat soluble vitamins.